Rule 34 Dev - 1boy 2020s 2021 anal animated_skeleton blue_blush blue_cum blue_hoodie blue_jacket blue_penis blush bone bottom_sans bottomless bottomless_male crying cum cum_while_penetrated cussing drooling ectopenis ectoplasm ejaculation erection fluids genital_fluids genitals hooded_jacket hoodie humanoid implied_masturbation insertion jacket male male_only male_penetrated monster monster_boy object_insertion penetration penis profanity sans sans_(undertale) skeleton socks solo solo_male submissive submissive_male swearing sweat tears uke_sans undead undertale undertale_(series) xxoxxkm_(pixiv_id_3871107)|1016565